Creationist visit to Wales

I wrote a piece for this week’s Big Issue on the controversial geologist John Mackay who is visiting Wales. He is the head of a creationist movement and believes there is evidence for the biblican flood in the Earth’s crust.
They are controversial views, ridiculous or fantasy to many of us, I’m sure, but are they really “dangerous” and “intellectual child abuse” as I saw one newspaper describe them this week?
Does everyone we disagree with have to be labelled a dangerous extremist now?